<?php
namespace app\common\controller;
define ('VERSION', '3.8.18');																		// Version of this script
//Load a config file if it exists. Otherwise, use the values below
if( file_exists(dirname(__FILE__) . '/timthumb-config.php'))	require_once('timthumb-config.php');
if(! defined('DEBUG_ON') )					define ('DEBUG_ON', false);								// Enable debug logging to web server error log (STDERR)
if(! defined('DEBUG_LEVEL') )				define ('DEBUG_LEVEL', 1);								// Debug level 1 is less noisy and 3 is the most noisy
if(! defined('MEMORY_LIMIT') )				define ('MEMORY_LIMIT', '30M');							// Set PHP memory limit
if(! defined('BLOCK_EXTERNAL_LEECHERS') ) 	define ('BLOCK_EXTERNAL_LEECHERS', false);				// If the image or webshot is being loaded on an external site, display a red "No Hotlinking" gif.
if(! defined('DISPLAY_ERROR_MESSAGES') )	define ('DISPLAY_ERROR_MESSAGES', true);				// Display error messages. Set to false to turn off errors (good for production websites)
//Image fetching and caching
if(! defined('ALLOW_EXTERNAL') )			define ('ALLOW_EXTERNAL', TRUE);						// Allow image fetching from external websites. Will check against ALLOWED_SITES if ALLOW_ALL_EXTERNAL_SITES is false
if(! defined('ALLOW_ALL_EXTERNAL_SITES') ) 	define ('ALLOW_ALL_EXTERNAL_SITES', false);				// Less secure.
if(! defined('FILE_CACHE_ENABLED') ) 		define ('FILE_CACHE_ENABLED', TRUE);					// Should we store resized/modified images on disk to speed things up?
if(! defined('FILE_CACHE_TIME_BETWEEN_CLEANS'))	define ('FILE_CACHE_TIME_BETWEEN_CLEANS', 86400);	// How often the cache is cleaned

if(! defined('FILE_CACHE_MAX_FILE_AGE') ) 	define ('FILE_CACHE_MAX_FILE_AGE', 86400);				// How old does a file have to be to be deleted from the cache
if(! defined('FILE_CACHE_SUFFIX') ) 		define ('FILE_CACHE_SUFFIX', '.imgs.txt');			// What to put at the end of all files in the cache directory so we can identify them
if(! defined('FILE_CACHE_PREFIX') ) 		define ('FILE_CACHE_PREFIX', 'img');				// What to put at the beg of all files in the cache directory so we can identify them
if(! defined('FILE_CACHE_DIRECTORY') ) 		define ('FILE_CACHE_DIRECTORY', './cache');				// Directory where images are cached. Left blank it will use the system temporary directory (which is better for security)
if(! defined('MAX_FILE_SIZE') )				define ('MAX_FILE_SIZE', 10485760);						// 10 Megs is 10485760. This is the max internal or external file size that we'll process.
if(! defined('CURL_TIMEOUT') )				define ('CURL_TIMEOUT', 20);							// Timeout duration for Curl. This only applies if you have Curl installed and aren't using PHP's default URL fetching mechanism.
if(! defined('WAIT_BETWEEN_FETCH_ERRORS') )	define ('WAIT_BETWEEN_FETCH_ERRORS', 3600);				// Time to wait between errors fetching remote file

//Browser caching
if(! defined('BROWSER_CACHE_MAX_AGE') ) 	define ('BROWSER_CACHE_MAX_AGE', 864000);				// Time to cache in the browser
if(! defined('BROWSER_CACHE_DISABLE') ) 	define ('BROWSER_CACHE_DISABLE', false);				// Use for testing if you want to disable all browser caching

//Image size and defaults
if(! defined('MAX_WIDTH') )					define ('MAX_WIDTH', 1500);								// Maximum image width
if(! defined('MAX_HEIGHT') )				define ('MAX_HEIGHT', 1500);							// Maximum image height
if(! defined('NOT_FOUND_IMAGE') )			define ('NOT_FOUND_IMAGE', '');							// Image to serve if any 404 occurs
if(! defined('ERROR_IMAGE') )				define ('ERROR_IMAGE', '');								// Image to serve if an error occurs instead of showing error message
if(! defined('PNG_IS_TRANSPARENT') )		define ('PNG_IS_TRANSPARENT', FALSE);					// Define if a png image should have a transparent background color. Use False value if you want to display a custom coloured canvas_colour
if(! defined('DEFAULT_Q') )					define ('DEFAULT_Q', 100);								// Default image quality. Allows overrid in timthumb-config.php
if(! defined('DEFAULT_ZC') )				define ('DEFAULT_ZC', 1);								// Default zoom/crop setting. Allows overrid in timthumb-config.php
if(! defined('DEFAULT_F') )					define ('DEFAULT_F', '');								// Default image filters. Allows overrid in timthumb-config.php
if(! defined('DEFAULT_S') )					define ('DEFAULT_S', 0);								// Default sharpen value. Allows overrid in timthumb-config.php
if(! defined('DEFAULT_CC') )				define ('DEFAULT_CC', 'ffffff');						// Default canvas colour. Allows overrid in timthumb-config.php
if(! defined('DEFAULT_WIDTH') )				define ('DEFAULT_WIDTH', 100);							// Default thumbnail width. Allows overrid in timthumb-config.php
if(! defined('DEFAULT_HEIGHT') )			define ('DEFAULT_HEIGHT', 100);							// Default thumbnail height. Allows overrid in timthumb-config.php
/**
 * Additional Parameters:
 * LOCAL_FILE_BASE_DIRECTORY = Override the DOCUMENT_ROOT. This is best used in timthumb-config.php
 */
if(! defined('OPTIPNG_ENABLED') ) 		define ('OPTIPNG_ENABLED', false);
if(! defined('OPTIPNG_PATH') ) 			define ('OPTIPNG_PATH', '/usr/bin/optipng'); //This will run first because it gives better compression than pngcrush.
if(! defined('PNGCRUSH_ENABLED') ) 		define ('PNGCRUSH_ENABLED', false);
if(! defined('PNGCRUSH_PATH') ) 		define ('PNGCRUSH_PATH', '/usr/bin/pngcrush'); //This will only run if OPTIPNG_PATH is not set or is not valid
if(! defined('WEBSHOT_ENABLED') ) 	define ('WEBSHOT_ENABLED', false);			//Beta feature. Adding webshot=1 to your query string will cause the script to return a browser screenshot rather than try to fetch an image.
if(! defined('WEBSHOT_CUTYCAPT') ) 	define ('WEBSHOT_CUTYCAPT', '/usr/local/bin/CutyCapt'); //The path to CutyCapt.
if(! defined('WEBSHOT_XVFB') ) 		define ('WEBSHOT_XVFB', '/usr/bin/xvfb-run');		//The path to the Xvfb server
if(! defined('WEBSHOT_SCREEN_X') ) 	define ('WEBSHOT_SCREEN_X', '1024');			//1024 works ok
if(! defined('WEBSHOT_SCREEN_Y') ) 	define ('WEBSHOT_SCREEN_Y', '768');			//768 works ok
if(! defined('WEBSHOT_COLOR_DEPTH') ) 	define ('WEBSHOT_COLOR_DEPTH', '24');			//I haven't tested anything besides 24
if(! defined('WEBSHOT_IMAGE_FORMAT') ) 	define ('WEBSHOT_IMAGE_FORMAT', 'png');			//png is about 2.5 times the size of jpg but is a LOT better quality
if(! defined('WEBSHOT_TIMEOUT') ) 	define ('WEBSHOT_TIMEOUT', '20');			//Seconds to wait for a webshot
if(! defined('WEBSHOT_USER_AGENT') ) 	define ('WEBSHOT_USER_AGENT', "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-GB; rv:1.9.2.18) Gecko/20110614 Firefox/3.6.18"); //I hate to do this, but a non-browser robot user agent might not show what humans see. So we pretend to be Firefox
if(! defined('WEBSHOT_JAVASCRIPT_ON') ) define ('WEBSHOT_JAVASCRIPT_ON', true);			//Setting to false might give you a slight speedup and block ads. But it could cause other issues.
if(! defined('WEBSHOT_JAVA_ON') ) 	define ('WEBSHOT_JAVA_ON', false);			//Have only tested this as fase
if(! defined('WEBSHOT_PLUGINS_ON') ) 	define ('WEBSHOT_PLUGINS_ON', true);			//Enable flash and other plugins
if(! defined('WEBSHOT_PROXY') ) 	define ('WEBSHOT_PROXY', '');				//In case you're behind a proxy server.
if(! defined('WEBSHOT_XVFB_RUNNING') )	define ('WEBSHOT_XVFB_RUNNING', false);			//ADVANCED: Enable this if you've got Xvfb running in the background.

// If ALLOW_EXTERNAL is true and ALLOW_ALL_EXTERNAL_SITES is false, then external images will only be fetched from these domains and their subdomains.
if(! isset($ALLOWED_SITES)){
    $ALLOWED_SITES = array (
        'flickr.com',
        'staticflickr.com',
        'picasa.com',
        'img.youtube.com',
        'upload.wikimedia.org',
        'photobucket.com',
        'imgur.com',
        'imageshack.us',
        'tinypic.com',
        'sopvip.com',
        'baidu.com',
    );
}
class images {
    protected $src = "";
    protected $deta = "";
    protected $is404 = false;
    protected $docRoot = "";
    protected $lastURLError = false;
    protected $localImage = "";
    protected $localImageMTime = 0;
    protected $url = false;
    protected $myHost = "";
    protected $isURL = false;
    protected $cachefile = '';
    protected $errors = array();
    protected $toDeletes = array();
    protected $cacheDirectory = '';
    protected $startTime = 0;
    protected $lastBenchTime = 0;
    protected $cropTop = false;
    protected $salt = "";
    protected $img_type = "";//图片地址类型
    protected $fileCacheVersion = 1; //Generally if timthumb.php is modifed (upgraded) then the salt changes and all cache files are recreated. This is a backup mechanism to force regen.
    protected $filePrependSecurityBlock = "<?php die('Execution denied!'); //"; //Designed to have three letter mime type, space, question mark and greater than symbol appended. 6 bytes total.
    protected static $curlDataWritten = 0;
    protected static $curlFH = false;
    public static function start($data){
        $tim = new images($data);
        $tim->handleErrors();
        $tim->securityChecks();
        if($tim->tryBrowserCache()){
            exit(0);
        }
        $tim->handleErrors();
        if(FILE_CACHE_ENABLED && $tim->tryServerCache()){
            exit(0);
        }
        $tim->handleErrors();
        $tim->run();
        $tim->handleErrors();
        exit(0);
    }
    public function __construct($data){
        global $ALLOWED_SITES;
        $this->startTime = microtime(true);
        $this->data = $data;
        date_default_timezone_set('UTC');
        $this->debug(1, "Starting new request from " . $this->getIP() . " to " . $_SERVER['REQUEST_URI']);
        $this->calcDocRoot();
        //On windows systems I'm assuming fileinode returns an empty string or a number that doesn't change. Check this.
        $this->salt = @filemtime(__FILE__) . '-' . @fileinode(__FILE__);
        $this->debug(3, "Salt is: " . $this->salt);
        if(FILE_CACHE_DIRECTORY){
            if(! is_dir(FILE_CACHE_DIRECTORY)){
                @mkdir(FILE_CACHE_DIRECTORY);
                if(! is_dir(FILE_CACHE_DIRECTORY)){
                    $this->error("Could not create the file cache directory.");
                    return false;
                }
            }
            $this->cacheDirectory = FILE_CACHE_DIRECTORY;
            if (!touch($this->cacheDirectory . '/index.html')) {
                $this->error("Could not create the index.html file - to fix this create an empty file named index.html file in the cache directory.");
            }
        } else {
            $this->cacheDirectory = sys_get_temp_dir();
        }
        //Clean the cache before we do anything because we don't want the first visitor after FILE_CACHE_TIME_BETWEEN_CLEANS expires to get a stale image.
        $this->cleanCache();
        $this->myHost = preg_replace('/^www\./i', '', $_SERVER['HTTP_HOST']);
        $this->src = $this->param('src');
        var_dump($this->src);die;
        $this->img_type = $this->param('type');
        if($this->img_type){
            $config = json_decode(file_get_contents("config.txt"),true);
            if(empty($config) || $config['baidu']['expires_in']<=time()) {
                $api_url = 'http://mp.sopvip.com/api/api.php?do=img_key&data=baidu';
                file_put_contents('config.txt', file_get_contents($api_url));
                $config = json_decode(file_get_contents("config.txt"), true);
            }
            switch($this->img_type){
                case 'baidu':
                    $remote_dir='/apps/SyncY/'.$config['baidu']['bucket'].'/'. $this->src;
                    $this->src="https://pcs.baidu.com/rest/2.0/pcs/file?method=download&access_token=".$config['baidu']['access_token']."&path=". $remote_dir;
                    $this->url = parse_url($this->src);
                    break;
                case 'cos':
                    $this->src=$config['cos']['url'].'/'. $this->src;
                    $this->url = parse_url($this->src);
                    break;
                case 'oss':
                    break;
                case 'qiniu':
                    break;
            }
        }else{
            $this->url = parse_url($this->src);
        }
        $this->src = preg_replace('/https?:\/\/(?:www\.)?' . $this->myHost . '/i', '', $this->src);
        if(strlen($this->src) <= 3){
            $this->error("No image specified");
            return false;
        }
        if(BLOCK_EXTERNAL_LEECHERS && array_key_exists('HTTP_REFERER', $_SERVER) && (! preg_match('/^https?:\/\/(?:www\.)?' . $this->myHost . '(?:$|\/)/i', $_SERVER['HTTP_REFERER']))){
            // base64 encoded red image that says 'no hotlinkers'
            // nothing to worry about! :)
            $imgData = base64_decode("R0lGODlhUAAMAIAAAP8AAP///yH5BAAHAP8ALAAAAABQAAwAAAJpjI+py+0Po5y0OgAMjjv01YUZ\nOGplhWXfNa6JCLnWkXplrcBmW+spbwvaVr/cDyg7IoFC2KbYVC2NQ5MQ4ZNao9Ynzjl9ScNYpneb\nDULB3RP6JuPuaGfuuV4fumf8PuvqFyhYtjdoeFgAADs=");
            header('Content-Type: image/gif');
            header('Content-Length: ' . strlen($imgData));
            header('Cache-Control: no-store, no-cache, must-revalidate, max-age=0');
            header("Pragma: no-cache");
            header('Expires: ' . gmdate ('D, d M Y H:i:s', time()));
            echo $imgData;
            return false;
            exit(0);
        }
        if(preg_match('/^https?:\/\/[^\/]+/i', $this->src)){
            $this->debug(2, "Is a request for an external URL: " . $this->src);
            $this->isURL = true;
        } else {
            $this->debug(2, "Is a request for an internal file: " . $this->src);
        }
        if($this->isURL && (! ALLOW_EXTERNAL)){
            $this->error("You are not allowed to fetch images from an external website.");
            return false;
        }
        if($this->isURL){
            if(ALLOW_ALL_EXTERNAL_SITES){
                $this->debug(2, "Fetching from all external sites is enabled.");
            } else {
                $this->debug(2, "Fetching only from selected external sites is enabled.");
                $allowed = false;
                foreach($ALLOWED_SITES as $site){
                    if ((strtolower(substr($this->url['host'],-strlen($site)-1)) === strtolower(".$site")) || (strtolower($this->url['host'])===strtolower($site))) {
                        $this->debug(3, "URL hostname {$this->url['host']} matches $site so allowing.");
                        $allowed = true;
                    }
                }
                if(! $allowed){
                    return $this->error("You may not fetch images from that site. To enable this site in timthumb, you can either add it to \$ALLOWED_SITES and set ALLOW_EXTERNAL=true. Or you can set ALLOW_ALL_EXTERNAL_SITES=true, depending on your security needs.");
                }
            }
        }
        $cachePrefix = ($this->isURL ? '_ext_' : '_int_');
        if($this->isURL){
            $arr = explode('&', $_SERVER ['QUERY_STRING']);
            asort($arr);
            $this->cachefile = $this->cacheDirectory . '/' . FILE_CACHE_PREFIX . $cachePrefix . md5($this->salt . implode('', $arr) . $this->fileCacheVersion) . FILE_CACHE_SUFFIX;
        } else {
            $this->localImage = $this->getLocalImagePath($this->src);
            if(! $this->localImage){
                $this->debug(1, "Could not find the local image: {$this->localImage}");
                $this->error("Could not find the internal image you specified.");
                $this->set404();
                return false;
            }
            $this->debug(1, "Local image path is {$this->localImage}");
            $this->localImageMTime = @filemtime($this->localImage);
            //We include the mtime of the local file in case in changes on disk.
            $this->cachefile = $this->cacheDirectory . '/' . FILE_CACHE_PREFIX . $cachePrefix . md5($this->salt . $this->localImageMTime . $_SERVER ['QUERY_STRING'] . $this->fileCacheVersion) . FILE_CACHE_SUFFIX;
        }
        $this->debug(2, "Cache file is: " . $this->cachefile);

        return true;
    }
    public function __destruct(){
        foreach($this->toDeletes as $del){
            $this->debug(2, "Deleting temp file $del");
            @unlink($del);
        }
    }
    public function run(){
        if($this->isURL){
            if(! ALLOW_EXTERNAL){
                $this->debug(1, "Got a request for an external image but ALLOW_EXTERNAL is disabled so returning error msg.");
                $this->error("You are not allowed to fetch images from an external website.");
                return false;
            }
            $this->debug(3, "Got request for external image. Starting serveExternalImage.");
            if($this->param('webshot')){
                if(WEBSHOT_ENABLED){
                    $this->debug(3, "webshot param is set, so we're going to take a webshot.");
                    $this->serveWebshot();
                } else {
                    $this->error("You added the webshot parameter but webshots are disabled on this server. You need to set WEBSHOT_ENABLED == true to enable webshots.");
                }
            } else {
                $this->debug(3, "webshot is NOT set so we're going to try to fetch a regular image.");
                $this->serveExternalImage();

            }
        } else {
            $this->debug(3, "Got request for internal image. Starting serveInternalImage()");
            $this->serveInternalImage();
        }
        return true;
    }
    protected function handleErrors(){
        if($this->haveErrors()){
            if(NOT_FOUND_IMAGE && $this->is404()){
                if($this->serveImg(NOT_FOUND_IMAGE)){
                    exit(0);
                } else {
                    $this->error("Additionally, the 404 image that is configured could not be found or there was an error serving it.");
                }
            }
            if(ERROR_IMAGE){
                if($this->serveImg(ERROR_IMAGE)){
                    exit(0);
                } else {
                    $this->error("Additionally, the error image that is configured could not be found or there was an error serving it.");
                }
            }
            $this->serveErrors();
            exit(0);
        }
        return false;
    }
    protected function tryBrowserCache(){
        if(BROWSER_CACHE_DISABLE){ $this->debug(3, "Browser caching is disabled"); return false; }
        if(!empty($_SERVER['HTTP_IF_MODIFIED_SINCE']) ){
            $this->debug(3, "Got a conditional get");
            $mtime = false;
            //We've already checked if the real file exists in the constructor
            if(! is_file($this->cachefile)){
                //If we don't have something cached, regenerate the cached image.
                return false;
            }
            if($this->localImageMTime){
                $mtime = $this->localImageMTime;
                $this->debug(3, "Local real file's modification time is $mtime");
            } else if(is_file($this->cachefile)){ //If it's not a local request then use the mtime of the cached file to determine the 304
                $mtime = @filemtime($this->cachefile);
                $this->debug(3, "Cached file's modification time is $mtime");
            }
            if(! $mtime){ return false; }

            $iftime = strtotime($_SERVER['HTTP_IF_MODIFIED_SINCE']);
            $this->debug(3, "The conditional get's if-modified-since unixtime is $iftime");
            if($iftime < 1){
                $this->debug(3, "Got an invalid conditional get modified since time. Returning false.");
                return false;
            }
            if($iftime < $mtime){ //Real file or cache file has been modified since last request, so force refetch.
                $this->debug(3, "File has been modified since last fetch.");
                return false;
            } else { //Otherwise serve a 304
                $this->debug(3, "File has not been modified since last get, so serving a 304.");
                header ($_SERVER['SERVER_PROTOCOL'] . ' 304 Not Modified');
                $this->debug(1, "Returning 304 not modified");
                return true;
            }
        }
        return false;
    }
    protected function tryServerCache(){
        $this->debug(3, "Trying server cache");
        if(file_exists($this->cachefile)){
            $this->debug(3, "Cachefile {$this->cachefile} exists");
            if($this->isURL){
                $this->debug(3, "This is an external request, so checking if the cachefile is empty which means the request failed previously.");
                if(filesize($this->cachefile) < 1){
                    $this->debug(3, "Found an empty cachefile indicating a failed earlier request. Checking how old it is.");
                    //Fetching error occured previously
                    if(time() - @filemtime($this->cachefile) > WAIT_BETWEEN_FETCH_ERRORS){
                        $this->debug(3, "File is older than " . WAIT_BETWEEN_FETCH_ERRORS . " seconds. Deleting and returning false so app can try and load file.");
                        @unlink($this->cachefile);
                        return false; //to indicate we didn't serve from cache and app should try and load
                    } else {
                        $this->debug(3, "Empty cachefile is still fresh so returning message saying we had an error fetching this image from remote host.");
                        $this->set404();
                        $this->error("An error occured fetching image.");
                        return false;
                    }
                }
            } else {
                $this->debug(3, "Trying to serve cachefile {$this->cachefile}");
            }
            if($this->serveCacheFile()){
                $this->debug(3, "Succesfully served cachefile {$this->cachefile}");
                return true;
            } else {
                $this->debug(3, "Failed to serve cachefile {$this->cachefile} - Deleting it from cache.");
                //Image serving failed. We can't retry at this point, but lets remove it from cache so the next request recreates it
                @unlink($this->cachefile);
                return true;
            }
        }
    }
    protected function error($err){
        $this->debug(3, "Adding error message: $err");
        $this->errors[] = $err;
        return false;

    }
    protected function haveErrors(){
        if(sizeof($this->errors) > 0){
            return true;
        }
        return false;
    }
    protected function serveErrors(){
        header ($_SERVER['SERVER_PROTOCOL'] . ' 400 Bad Request');
        if ( ! DISPLAY_ERROR_MESSAGES ) {
            return;
        }
//        $html = '<ul>';
//        foreach($this->errors as $err){
//            $html .= '<li>' . htmlentities($err) . '</li>';
//        }
//        $html .= '</ul>';
     // echo '<h1>错误：</h1>未发现目标资源<br />' . $html . '<br />';
        echo '<h1>错误：</h1>未发现目标资源<br />';
        echo '<br />Query String : ' . htmlentities( $_SERVER['QUERY_STRING'], ENT_QUOTES );
        echo '<br />ZOOMTK-Thumb version : ' . VERSION . '</pre>';
    }
    protected function serveInternalImage(){
        $this->debug(3, "Local image path is $this->localImage");
        if(! $this->localImage){
            $this->sanityFail("localImage not set after verifying it earlier in the code.");
            return false;
        }
        $fileSize = filesize($this->localImage);
        if($fileSize > MAX_FILE_SIZE){
            $this->error("The file you specified is greater than the maximum allowed file size.");
            return false;
        }
        if($fileSize <= 0){
            $this->error("The file you specified is <= 0 bytes.");
            return false;
        }
        $this->debug(3, "Calling processImageAndWriteToCache() for local image.");
        if($this->processImageAndWriteToCache($this->localImage)){
            $this->serveCacheFile();
            return true;
        } else {
            return false;
        }
    }
    protected function cleanCache(){
        if (FILE_CACHE_TIME_BETWEEN_CLEANS < 0) {
            return;
        }
        $this->debug(3, "cleanCache() called");
        $lastCleanFile = $this->cacheDirectory . '/timthumb_cacheLastCleanTime.touch';

        //If this is a new timthumb installation we need to create the file
        if(! is_file($lastCleanFile)){
            $this->debug(1, "File tracking last clean doesn't exist. Creating $lastCleanFile");
            if (!touch($lastCleanFile)) {
                $this->error("Could not create cache clean timestamp file.");
            }
            return;
        }
        $files = glob($this->cacheDirectory . '/*' . FILE_CACHE_SUFFIX);
        $dirsize='';
        foreach($files as $file){
            $dirsize +=@filesize($file);
        }
        if(@filemtime($lastCleanFile) < (time() - FILE_CACHE_TIME_BETWEEN_CLEANS) || $dirsize>=1908408320){ //Cache was last cleaned more than 1 day ago
            $this->debug(1, "Cache was last cleaned more than " . FILE_CACHE_TIME_BETWEEN_CLEANS . " seconds ago. Cleaning now.");
            // Very slight race condition here, but worst case we'll have 2 or 3 servers cleaning the cache simultaneously once a day.
            if (!touch($lastCleanFile)) {
                $this->error("Could not create cache clean timestamp file.");
            }
            if ($files) {
                $timeAgo = time() - FILE_CACHE_MAX_FILE_AGE;
                $timekey = time() - 43200;
                foreach($files as $file){
                    if(@filemtime($file) < $timeAgo){
                        $this->debug(3, "Deleting cache file $file older than max age: " . FILE_CACHE_MAX_FILE_AGE . " seconds");
                        @unlink($file);
                    }
                }
                if($dirsize>=1908408320){
                    foreach($files as $_file){
                        if(@filemtime($_file) < $timekey){
                            $this->debug(3, "Deleting cache file $_file older than max age: " . FILE_CACHE_MAX_FILE_AGE . " seconds");
                            @unlink($_file);
                        }
                    }
                }
            }
            return true;
        } else {
            $this->debug(3, "Cache was cleaned less than " . FILE_CACHE_TIME_BETWEEN_CLEANS . " seconds ago so no cleaning needed.");
        }
        return false;
    }
    protected function processImageAndWriteToCache($localImage){
        $sData = getimagesize($localImage);
        $origType = $sData[2];
        $mimeType = $sData['mime'];

        $this->debug(3, "Mime type of image is $mimeType");
        if(! preg_match('/^image\/(?:gif|jpg|jpeg|png)$/i', $mimeType)){
            return $this->error("The image being resized is not a valid gif, jpg or png.");
        }

        if (!function_exists ('imagecreatetruecolor')) {
            return $this->error('GD Library Error: imagecreatetruecolor does not exist - please contact your webhost and ask them to install the GD library');
        }

        if (function_exists ('imagefilter') && defined ('IMG_FILTER_NEGATE')) {
            $imageFilters = array (
                1 => array (IMG_FILTER_NEGATE, 0),
                2 => array (IMG_FILTER_GRAYSCALE, 0),
                3 => array (IMG_FILTER_BRIGHTNESS, 1),
                4 => array (IMG_FILTER_CONTRAST, 1),
                5 => array (IMG_FILTER_COLORIZE, 4),
                6 => array (IMG_FILTER_EDGEDETECT, 0),
                7 => array (IMG_FILTER_EMBOSS, 0),
                8 => array (IMG_FILTER_GAUSSIAN_BLUR, 0),
                9 => array (IMG_FILTER_SELECTIVE_BLUR, 0),
                10 => array (IMG_FILTER_MEAN_REMOVAL, 0),
                11 => array (IMG_FILTER_SMOOTH, 0),
            );
        }

        // get standard input properties
        $new_width =  (int) abs ($this->param('w', 0));
        $new_height = (int) abs ($this->param('h', 0));
        $zoom_crop = (int) $this->param('zc', DEFAULT_ZC);
        $quality = (int) abs ($this->param('q', DEFAULT_Q));
        $align = $this->cropTop ? 't' : $this->param('a', 'c');
        $filters = $this->param('f', DEFAULT_F);
        $sharpen = (bool) $this->param('s', DEFAULT_S);
        $canvas_color = $this->param('cc', DEFAULT_CC);
        $canvas_trans = (bool) $this->param('ct', '1');



        // set memory limit to be able to have enough space to resize larger images
        $this->setMemoryLimit();

        // open the existing image
        $image = $this->openImage ($mimeType, $localImage);
        if ($image === false) {
            return $this->error('Unable to open image.');
        }

        // set default width and height if neither are set already
        if ($new_width == 0 && $new_height == 0) {
            $new_width = imagesx ($image);
            $new_height =  imagesy ($image);
        }

        // ensure size limits can not be abused
        $new_width = min ($new_width, MAX_WIDTH);
        $new_height = min ($new_height, MAX_HEIGHT);
        // Get original width and height
        $width = imagesx ($image);
        $height = imagesy ($image);
        $origin_x = 0;
        $origin_y = 0;

        // generate new w/h if not provided
        if ($new_width && !$new_height) {
            $new_height = floor ($height * ($new_width / $width));
        } else if ($new_height && !$new_width) {
            $new_width = floor ($width * ($new_height / $height));
        }

        // scale down and add borders
        if ($zoom_crop == 3) {

            $final_height = $height * ($new_width / $width);

            if ($final_height > $new_height) {
                $new_width = $width * ($new_height / $height);
            } else {
                $new_height = $final_height;
            }

        }

        // create a new true color image
        $canvas = imagecreatetruecolor ($new_width, $new_height);
        imagealphablending ($canvas, false);

        if (strlen($canvas_color) == 3) { //if is 3-char notation, edit string into 6-char notation
            $canvas_color =  str_repeat(substr($canvas_color, 0, 1), 2) . str_repeat(substr($canvas_color, 1, 1), 2) . str_repeat(substr($canvas_color, 2, 1), 2);
        } else if (strlen($canvas_color) != 6) {
            $canvas_color = DEFAULT_CC; // on error return default canvas color
        }

        $canvas_color_R = hexdec (substr ($canvas_color, 0, 2));
        $canvas_color_G = hexdec (substr ($canvas_color, 2, 2));
        $canvas_color_B = hexdec (substr ($canvas_color, 4, 2));

        // Create a new transparent color for image
        // If is a png and PNG_IS_TRANSPARENT is false then remove the alpha transparency
        // (and if is set a canvas color show it in the background)
        if(preg_match('/^image\/png$/i', $mimeType) && !PNG_IS_TRANSPARENT && $canvas_trans){
            $color = imagecolorallocatealpha ($canvas, $canvas_color_R, $canvas_color_G, $canvas_color_B, 127);
        }else{
            $color = imagecolorallocatealpha ($canvas, $canvas_color_R, $canvas_color_G, $canvas_color_B, 0);
        }


        // Completely fill the background of the new image with allocated color.
        imagefill ($canvas, 0, 0, $color);

        // scale down and add borders
        if ($zoom_crop == 2) {

            $final_height = $height * ($new_width / $width);

            if ($final_height > $new_height) {

                $origin_x = $new_width / 2;
                $new_width = $width * ($new_height / $height);
                $origin_x = round ($origin_x - ($new_width / 2));

            } else {

                $origin_y = $new_height / 2;
                $new_height = $final_height;
                $origin_y = round ($origin_y - ($new_height / 2));

            }

        }

        // Restore transparency blending
        imagesavealpha ($canvas, true);

        if ($zoom_crop > 0) {

            $src_x = $src_y = 0;
            $src_w = $width;
            $src_h = $height;

            $cmp_x = $width / $new_width;
            $cmp_y = $height / $new_height;

            // calculate x or y coordinate and width or height of source
            if ($cmp_x > $cmp_y) {

                $src_w = round ($width / $cmp_x * $cmp_y);
                $src_x = round (($width - ($width / $cmp_x * $cmp_y)) / 2);

            } else if ($cmp_y > $cmp_x) {

                $src_h = round ($height / $cmp_y * $cmp_x);
                $src_y = round (($height - ($height / $cmp_y * $cmp_x)) / 2);

            }

            // positional cropping!
            if ($align) {
                if (strpos ($align, 't') !== false) {
                    $src_y = 0;
                }
                if (strpos ($align, 'b') !== false) {
                    $src_y = $height - $src_h;
                }
                if (strpos ($align, 'l') !== false) {
                    $src_x = 0;
                }
                if (strpos ($align, 'r') !== false) {
                    $src_x = $width - $src_w;
                }
            }

            imagecopyresampled ($canvas, $image, $origin_x, $origin_y, $src_x, $src_y, $new_width, $new_height, $src_w, $src_h);

        } else {

            // copy and resize part of an image with resampling
            imagecopyresampled ($canvas, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);

        }

        if ($filters != '' && function_exists ('imagefilter') && defined ('IMG_FILTER_NEGATE')) {
            // apply filters to image
            $filterList = explode ('|', $filters);
            foreach ($filterList as $fl) {

                $filterSettings = explode (',', $fl);
                if (isset ($imageFilters[$filterSettings[0]])) {

                    for ($i = 0; $i < 4; $i ++) {
                        if (!isset ($filterSettings[$i])) {
                            $filterSettings[$i] = null;
                        } else {
                            $filterSettings[$i] = (int) $filterSettings[$i];
                        }
                    }

                    switch ($imageFilters[$filterSettings[0]][1]) {

                        case 1:

                            imagefilter ($canvas, $imageFilters[$filterSettings[0]][0], $filterSettings[1]);
                            break;

                        case 2:

                            imagefilter ($canvas, $imageFilters[$filterSettings[0]][0], $filterSettings[1], $filterSettings[2]);
                            break;

                        case 3:

                            imagefilter ($canvas, $imageFilters[$filterSettings[0]][0], $filterSettings[1], $filterSettings[2], $filterSettings[3]);
                            break;

                        case 4:

                            imagefilter ($canvas, $imageFilters[$filterSettings[0]][0], $filterSettings[1], $filterSettings[2], $filterSettings[3], $filterSettings[4]);
                            break;

                        default:

                            imagefilter ($canvas, $imageFilters[$filterSettings[0]][0]);
                            break;

                    }
                }
            }
        }

        // sharpen image
        if ($sharpen && function_exists ('imageconvolution')) {

            $sharpenMatrix = array (
                array (-1,-1,-1),
                array (-1,16,-1),
                array (-1,-1,-1),
            );

            $divisor = 8;
            $offset = 0;

            imageconvolution ($canvas, $sharpenMatrix, $divisor, $offset);

        }
        //Straight from Wordpress core code. Reduces filesize by up to 70% for PNG's
        if ( (IMAGETYPE_PNG == $origType || IMAGETYPE_GIF == $origType) && function_exists('imageistruecolor') && !imageistruecolor( $image ) && imagecolortransparent( $image ) > 0 ){
            imagetruecolortopalette( $canvas, false, imagecolorstotal( $image ) );
        }

        $imgType = "";
        $tempfile = tempnam($this->cacheDirectory, 'timthumb_tmpimg_');
        if(preg_match('/^image\/(?:jpg|jpeg)$/i', $mimeType)){
            $imgType = 'jpg';
            imagejpeg($canvas, $tempfile, $quality);
        } else if(preg_match('/^image\/png$/i', $mimeType)){
            $imgType = 'png';
            imagepng($canvas, $tempfile, floor($quality * 0.09));
        } else if(preg_match('/^image\/gif$/i', $mimeType)){
            $imgType = 'gif';
            imagegif($canvas, $tempfile);
        } else {
            return $this->sanityFail("Could not match mime type after verifying it previously.");
        }
        if($imgType == 'png' && OPTIPNG_ENABLED && OPTIPNG_PATH && @is_file(OPTIPNG_PATH)){
            $exec = OPTIPNG_PATH;
            $this->debug(3, "optipng'ing $tempfile");
            $presize = filesize($tempfile);
            $out = `$exec -o1 $tempfile`; //you can use up to -o7 but it really slows things down
            clearstatcache();
            $aftersize = filesize($tempfile);
            $sizeDrop = $presize - $aftersize;
            if($sizeDrop > 0){
                $this->debug(1, "optipng reduced size by $sizeDrop");
            } else if($sizeDrop < 0){
                $this->debug(1, "optipng increased size! Difference was: $sizeDrop");
            } else {
                $this->debug(1, "optipng did not change image size.");
            }
        } else if($imgType == 'png' && PNGCRUSH_ENABLED && PNGCRUSH_PATH && @is_file(PNGCRUSH_PATH)){
            $exec = PNGCRUSH_PATH;
            $tempfile2 = tempnam($this->cacheDirectory, 'timthumb_tmpimg_');
            $this->debug(3, "pngcrush'ing $tempfile to $tempfile2");
            $out = `$exec $tempfile $tempfile2`;
            $todel = "";
            if(is_file($tempfile2)){
                $sizeDrop = filesize($tempfile) - filesize($tempfile2);
                if($sizeDrop > 0){
                    $this->debug(1, "pngcrush was succesful and gave a $sizeDrop byte size reduction");
                    $todel = $tempfile;
                    $tempfile = $tempfile2;
                } else {
                    $this->debug(1, "pngcrush did not reduce file size. Difference was $sizeDrop bytes.");
                    $todel = $tempfile2;
                }
            } else {
                $this->debug(3, "pngcrush failed with output: $out");
                $todel = $tempfile2;
            }
            @unlink($todel);
        }
        $this->debug(3, "Rewriting image with security header.");
        $tempfile4 = tempnam($this->cacheDirectory, 'timthumb_tmpimg_');
        $context = stream_context_create ();
        $fp = fopen($tempfile,'r',0,$context);
        file_put_contents($tempfile4, $this->filePrependSecurityBlock . $imgType . ' ?' . '>'); //6 extra bytes, first 3 being image type
        file_put_contents($tempfile4, $fp, FILE_APPEND);
        fclose($fp);
        @unlink($tempfile);
        $this->debug(3, "Locking and replacing cache file.");
        $lockFile = $this->cachefile . '.lock';
        $fh = fopen($lockFile, 'w');
        if(! $fh){
            return $this->error("Could not open the lockfile for writing an image.");
        }
        if(flock($fh, LOCK_EX)){
            @unlink($this->cachefile); //rename generally overwrites, but doing this in case of platform specific quirks. File might not exist yet.
            rename($tempfile4, $this->cachefile);
            flock($fh, LOCK_UN);
            fclose($fh);
            @unlink($lockFile);
        } else {
            fclose($fh);
            @unlink($lockFile);
            @unlink($tempfile4);
            return $this->error("Could not get a lock for writing.");
        }
        $this->debug(3, "Done image replace with security header. Cleaning up and running cleanCache()");
        imagedestroy($canvas);
        imagedestroy($image);
        return true;
    }
    protected function calcDocRoot(){
        $docRoot = @$_SERVER['DOCUMENT_ROOT'];
        if (defined('LOCAL_FILE_BASE_DIRECTORY')) {
            $docRoot = LOCAL_FILE_BASE_DIRECTORY;
        }
        if(!isset($docRoot)){
            $this->debug(3, "DOCUMENT_ROOT is not set. This is probably windows. Starting search 1.");
            if(isset($_SERVER['SCRIPT_FILENAME'])){
                $docRoot = str_replace( '\\', '/', substr($_SERVER['SCRIPT_FILENAME'], 0, 0-strlen($_SERVER['PHP_SELF'])));
                $this->debug(3, "Generated docRoot using SCRIPT_FILENAME and PHP_SELF as: $docRoot");
            }
        }
        if(!isset($docRoot)){
            $this->debug(3, "DOCUMENT_ROOT still is not set. Starting search 2.");
            if(isset($_SERVER['PATH_TRANSLATED'])){
                $docRoot = str_replace( '\\', '/', substr(str_replace('\\\\', '\\', $_SERVER['PATH_TRANSLATED']), 0, 0-strlen($_SERVER['PHP_SELF'])));
                $this->debug(3, "Generated docRoot using PATH_TRANSLATED and PHP_SELF as: $docRoot");
            }
        }
        if($docRoot && $_SERVER['DOCUMENT_ROOT'] != '/'){ $docRoot = preg_replace('/\/$/', '', $docRoot); }
        $this->debug(3, "Doc root is: " . $docRoot);
        $this->docRoot = $docRoot;

    }
    protected function getLocalImagePath($src){
        $src = ltrim($src, '/'); //strip off the leading '/'
        if(! $this->docRoot){
            $this->debug(3, "We have no document root set, so as a last resort, lets check if the image is in the current dir and serve that.");
            //We don't support serving images outside the current dir if we don't have a doc root for security reasons.
            $file = preg_replace('/^.*?([^\/\\\\]+)$/', '$1', $src); //strip off any path info and just leave the filename.
            if(is_file($file)){
                return $this->realpath($file);
            }
            return $this->error("Could not find your website document root and the file specified doesn't exist in timthumbs directory. We don't support serving files outside timthumb's directory without a document root for security reasons.");
        } else if ( ! is_dir( $this->docRoot ) ) {
            $this->error("Server path does not exist. Ensure variable \$_SERVER['DOCUMENT_ROOT'] is set correctly");
        }

        //Do not go past this point without docRoot set

        //Try src under docRoot
        if(file_exists ($this->docRoot . '/' . $src)) {
            $this->debug(3, "Found file as " . $this->docRoot . '/' . $src);
            $real = $this->realpath($this->docRoot . '/' . $src);
            if(stripos($real, $this->docRoot) === 0){
                return $real;
            } else {
                $this->debug(1, "Security block: The file specified occurs outside the document root.");
                //allow search to continue
            }
        }
        //Check absolute paths and then verify the real path is under doc root
        $absolute = $this->realpath('/' . $src);
        if($absolute && file_exists($absolute)){ //realpath does file_exists check, so can probably skip the exists check here
            $this->debug(3, "Found absolute path: $absolute");
            if(! $this->docRoot){ $this->sanityFail("docRoot not set when checking absolute path."); }
            if(stripos($absolute, $this->docRoot) === 0){
                return $absolute;
            } else {
                $this->debug(1, "Security block: The file specified occurs outside the document root.");
                //and continue search
            }
        }
        $base = $this->docRoot;
        // account for Windows directory structure
        if (strstr($_SERVER['SCRIPT_FILENAME'],':')) {
            $sub_directories = explode('\\', str_replace($this->docRoot, '', $_SERVER['SCRIPT_FILENAME']));
        } else {
            $sub_directories = explode('/', str_replace($this->docRoot, '', $_SERVER['SCRIPT_FILENAME']));
        }

        foreach ($sub_directories as $sub){
            $base .= $sub . '/';
            $this->debug(3, "Trying file as: " . $base . $src);
            if(file_exists($base . $src)){
                $this->debug(3, "Found file as: " . $base . $src);
                $real = $this->realpath($base . $src);
                if(stripos($real, $this->realpath($this->docRoot)) === 0){
                    return $real;
                } else {
                    $this->debug(1, "Security block: The file specified occurs outside the document root.");
                    //And continue search
                }
            }
        }
        return false;
    }
    protected function realpath($path){
        //try to remove any relative paths
        $remove_relatives = '/\w+\/\.\.\//';
        while(preg_match($remove_relatives,$path)){
            $path = preg_replace($remove_relatives, '', $path);
        }
        //if any remain use PHP realpath to strip them out, otherwise return $path
        //if using realpath, any symlinks will also be resolved
        return preg_match('#^\.\./|/\.\./#', $path) ? realpath($path) : $path;
    }
    protected function toDelete($name){
        $this->debug(3, "Scheduling file $name to delete on destruct.");
        $this->toDeletes[] = $name;
    }
    protected function serveWebshot(){
        $this->debug(3, "Starting serveWebshot");
        $instr = "Please follow the instructions at http://code.google.com/p/timthumb/ to set your server up for taking website screenshots.";
        if(! is_file(WEBSHOT_CUTYCAPT)){
            return $this->error("CutyCapt is not installed. $instr");
        }
        if(! is_file(WEBSHOT_XVFB)){
            return $this->Error("Xvfb is not installed. $instr");
        }
        $cuty = WEBSHOT_CUTYCAPT;
        $xv = WEBSHOT_XVFB;
        $screenX = WEBSHOT_SCREEN_X;
        $screenY = WEBSHOT_SCREEN_Y;
        $colDepth = WEBSHOT_COLOR_DEPTH;
        $format = WEBSHOT_IMAGE_FORMAT;
        $timeout = WEBSHOT_TIMEOUT * 1000;
        $ua = WEBSHOT_USER_AGENT;
        $jsOn = WEBSHOT_JAVASCRIPT_ON ? 'on' : 'off';
        $javaOn = WEBSHOT_JAVA_ON ? 'on' : 'off';
        $pluginsOn = WEBSHOT_PLUGINS_ON ? 'on' : 'off';
        $proxy = WEBSHOT_PROXY ? ' --http-proxy=' . WEBSHOT_PROXY : '';
        $tempfile = tempnam($this->cacheDirectory, 'timthumb_webshot');
        $url = $this->src;
        if(! preg_match('/^https?:\/\/[a-zA-Z0-9\.\-]+/i', $url)){
            return $this->error("Invalid URL supplied.");
        }
        $url = preg_replace('/[^A-Za-z0-9\-\.\_:\/\?\&\+\;\=]+/', '', $url); //RFC 3986 plus ()$ chars to prevent exploit below. Plus the following are also removed: @*!~#[]',
        // 2014 update by Mark Maunder: This exploit: http://cxsecurity.com/issue/WLB-2014060134
        // uses the $(command) shell execution syntax to execute arbitrary shell commands as the web server user.
        // So we're now filtering out the characters: '$', '(' and ')' in the above regex to avoid this.
        // We are also filtering out chars rarely used in URLs but legal accoring to the URL RFC which might be exploitable. These include: @*!~#[]',
        // We're doing this because we're passing this URL to the shell and need to make very sure it's not going to execute arbitrary commands.
        if(WEBSHOT_XVFB_RUNNING){
            putenv('DISPLAY=:100.0');
            $command = "$cuty $proxy --max-wait=$timeout --user-agent=\"$ua\" --javascript=$jsOn --java=$javaOn --plugins=$pluginsOn --js-can-open-windows=off --url=\"$url\" --out-format=$format --out=$tempfile";
        } else {
            $command = "$xv --server-args=\"-screen 0, {$screenX}x{$screenY}x{$colDepth}\" $cuty $proxy --max-wait=$timeout --user-agent=\"$ua\" --javascript=$jsOn --java=$javaOn --plugins=$pluginsOn --js-can-open-windows=off --url=\"$url\" --out-format=$format --out=$tempfile";
        }
        $this->debug(3, "Executing command: $command");
        $out = `$command`;
        $this->debug(3, "Received output: $out");
        if(! is_file($tempfile)){
            $this->set404();
            return $this->error("The command to create a thumbnail failed.");
        }
        $this->cropTop = true;
        if($this->processImageAndWriteToCache($tempfile)){
            $this->debug(3, "Image processed succesfully. Serving from cache");
            return $this->serveCacheFile();
        } else {
            return false;
        }
    }
    protected function serveExternalImage(){
        if(! preg_match('/^https?:\/\/[a-zA-Z0-9\-\.]+/i', $this->src)){
            $this->error("Invalid URL supplied.");
            return false;
        }
        $tempfile = tempnam($this->cacheDirectory, 'timthumb');
        $this->debug(3, "Fetching external image into temporary file $tempfile");
        $this->toDelete($tempfile);
        #fetch file here
        if(! $this->getURL($this->src, $tempfile)){
            @unlink($this->cachefile);
            touch($this->cachefile);
            $this->debug(3, "Error fetching URL: " . $this->lastURLError);
            $this->error("Error reading the URL you specified from remote host." . $this->lastURLError);
            return false;
        }

        $mimeType = $this->getMimeType($tempfile);
        if(! preg_match("/^image\/(?:jpg|jpeg|gif|png)$/i", $mimeType)){
            $this->debug(3, "Remote file has invalid mime type: $mimeType");
            @unlink($this->cachefile);
            touch($this->cachefile);
            $this->error("The remote file is not a valid image. Mimetype = '" . $mimeType . "'" . $tempfile);
            return false;
        }
        if($this->processImageAndWriteToCache($tempfile)){
            $this->debug(3, "Image processed succesfully. Serving from cache");
            return $this->serveCacheFile();
        } else {
            return false;
        }
    }
    public static function curlWrite($h, $d){
        fwrite(self::$curlFH, $d);
        self::$curlDataWritten += strlen($d);
        if(self::$curlDataWritten > MAX_FILE_SIZE){
            return 0;
        } else {
            return strlen($d);
        }
    }
    protected function serveCacheFile(){
        $this->debug(3, "Serving {$this->cachefile}");
        if(! is_file($this->cachefile)){
            $this->error("serveCacheFile called in timthumb but we couldn't find the cached file.");
            return false;
        }
        $fp = fopen($this->cachefile, 'rb');
        if(! $fp){ return $this->error("Could not open cachefile."); }
        fseek($fp, strlen($this->filePrependSecurityBlock), SEEK_SET);
        $imgType = fread($fp, 3);
        fseek($fp, 3, SEEK_CUR);
        if(ftell($fp) != strlen($this->filePrependSecurityBlock) + 6){
            @unlink($this->cachefile);
            return $this->error("The cached image file seems to be corrupt.");
        }
        $imageDataSize = filesize($this->cachefile) - (strlen($this->filePrependSecurityBlock) + 6);
        $this->sendImageHeaders($imgType, $imageDataSize);
        $bytesSent = @fpassthru($fp);
        fclose($fp);
        if($bytesSent > 0){
            return true;
        }
        $content = file_get_contents ($this->cachefile);
        if ($content != FALSE) {
            $content = substr($content, strlen($this->filePrependSecurityBlock) + 6);
            echo $content;
            $this->debug(3, "Served using file_get_contents and echo");
            return true;
        } else {
            $this->error("Cache file could not be loaded.");
            return false;
        }
    }
    protected function sendImageHeaders($mimeType, $dataSize){
        if(! preg_match('/^image\//i', $mimeType)){
            $mimeType = 'image/' . $mimeType;
        }
        if(strtolower($mimeType) == 'image/jpg'){
            $mimeType = 'image/jpeg';
        }
        $gmdate_expires = gmdate ('D, d M Y H:i:s', strtotime ('now +10 days')) . ' GMT';
        $gmdate_modified = gmdate ('D, d M Y H:i:s') . ' GMT';
        // send content headers then display image
        header ('Content-Type: ' . $mimeType);
        header ('Accept-Ranges: none'); //Changed this because we don't accept range requests
        header ('Last-Modified: ' . $gmdate_modified);
        header ('Content-Length: ' . $dataSize);
        if(BROWSER_CACHE_DISABLE){
            $this->debug(3, "Browser cache is disabled so setting non-caching headers.");
            header('Cache-Control: no-store, no-cache, must-revalidate, max-age=0');
            header("Pragma: no-cache");
            header('Expires: ' . gmdate ('D, d M Y H:i:s', time()));
        } else {
            $this->debug(3, "Browser caching is enabled");
            header('Cache-Control: max-age=' . BROWSER_CACHE_MAX_AGE . ', must-revalidate');
            header('Expires: ' . $gmdate_expires);
        }
        return true;
    }
    protected function securityChecks(){
    }
    protected function param($property, $default = ''){
        if (isset ($this->data[$property])) {
            return $this->data[$property];
        } else {
            return $default;
        }
    }
    protected function openImage($mimeType, $src){
        switch ($mimeType) {
            case 'image/jpeg':
                $image = imagecreatefromjpeg ($src);
                break;

            case 'image/png':
                $image = imagecreatefrompng ($src);
                imagealphablending( $image, true );
                imagesavealpha( $image, true );
                break;

            case 'image/gif':
                $image = imagecreatefromgif ($src);
                break;

            default:
                $this->error("Unrecognised mimeType");
        }

        return $image;
    }
    protected function getIP(){
        $rem = @$_SERVER["REMOTE_ADDR"];
        $ff = @$_SERVER["HTTP_X_FORWARDED_FOR"];
        $ci = @$_SERVER["HTTP_CLIENT_IP"];
        if(preg_match('/^(?:192\.168|172\.16|10\.|127\.)/', $rem)){
            if($ff){ return $ff; }
            if($ci){ return $ci; }
            return $rem;
        } else {
            if($rem){ return $rem; }
            if($ff){ return $ff; }
            if($ci){ return $ci; }
            return "UNKNOWN";
        }
    }
    protected function debug($level, $msg){
        if(DEBUG_ON && $level <= DEBUG_LEVEL){
            $execTime = sprintf('%.6f', microtime(true) - $this->startTime);
            $tick = sprintf('%.6f', 0);
            if($this->lastBenchTime > 0){
                $tick = sprintf('%.6f', microtime(true) - $this->lastBenchTime);
            }
            $this->lastBenchTime = microtime(true);
            error_log("TimThumb Debug line " . __LINE__ . " [$execTime : $tick]: $msg");
        }
    }
    protected function sanityFail($msg){
        return $this->error("There is a problem in the timthumb code. Message: Please report this error at <a href='http://code.google.com/p/timthumb/issues/list'>timthumb's bug tracking page</a>: $msg");
    }
    protected function getMimeType($file){
        $info = getimagesize($file);
        if(is_array($info) && $info['mime']){
            return $info['mime'];
        }
        return '';
    }
    protected function setMemoryLimit(){
        $inimem = ini_get('memory_limit');
        $inibytes = images::returnBytes($inimem);
        $ourbytes = images::returnBytes(MEMORY_LIMIT);
        if($inibytes < $ourbytes){
            ini_set ('memory_limit', MEMORY_LIMIT);
            $this->debug(3, "Increased memory from $inimem to " . MEMORY_LIMIT);
        } else {
            $this->debug(3, "Not adjusting memory size because the current setting is " . $inimem . " and our size of " . MEMORY_LIMIT . " is smaller.");
        }
    }
    protected static function returnBytes($size_str){
        switch (substr ($size_str, -1))
        {
            case 'M': case 'm': return (int)$size_str * 1048576;
            case 'K': case 'k': return (int)$size_str * 1024;
            case 'G': case 'g': return (int)$size_str * 1073741824;
            default: return $size_str;
        }
    }

    protected function getURL($url, $tempfile){
        $this->lastURLError = false;
        $url = preg_replace('/ /', '%20', $url);
        if(function_exists('curl_init')){
            $this->debug(3, "Curl is installed so using it to fetch URL.");
            self::$curlFH = fopen($tempfile, 'w');
            if(! self::$curlFH){
                $this->error("Could not open $tempfile for writing.");
                return false;
            }
            self::$curlDataWritten = 0;
            $this->debug(3, "Fetching url with curl: $url");
            $curl = curl_init($url);
            curl_setopt ($curl, CURLOPT_TIMEOUT, CURL_TIMEOUT);
            curl_setopt ($curl, CURLOPT_USERAGENT, "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/534.30 (KHTML, like Gecko) Chrome/12.0.742.122 Safari/534.30");
            curl_setopt ($curl, CURLOPT_RETURNTRANSFER, TRUE);
            curl_setopt ($curl, CURLOPT_HEADER, 0);
            curl_setopt ($curl, CURLOPT_SSL_VERIFYPEER, FALSE);
            curl_setopt ($curl, CURLOPT_WRITEFUNCTION, 'timthumb::curlWrite');
            @curl_setopt ($curl, CURLOPT_FOLLOWLOCATION, true);
            @curl_setopt ($curl, CURLOPT_MAXREDIRS, 10);

            $curlResult = curl_exec($curl);
            fclose(self::$curlFH);
            $httpStatus = curl_getinfo($curl, CURLINFO_HTTP_CODE);
            if($httpStatus == 404){
                $this->set404();
            }
            if($httpStatus == 302){
                $this->error("External Image is Redirecting. Try alternate image url");
                return false;
            }
            if($curlResult){
                curl_close($curl);
                return true;
            } else {
                $this->lastURLError = curl_error($curl);
                curl_close($curl);
                return false;
            }
        } else {
            $img = @file_get_contents ($url);
            if($img === false){
                $err = error_get_last();
                if(is_array($err) && $err['message']){
                    $this->lastURLError = $err['message'];
                } else {
                    $this->lastURLError = $err;
                }
                if(preg_match('/404/', $this->lastURLError)){
                    $this->set404();
                }

                return false;
            }
            if(! file_put_contents($tempfile, $img)){
                $this->error("Could not write to $tempfile.");
                return false;
            }
            return true;
        }

    }
    protected function serveImg($file){
        $s = getimagesize($file);
        if(! ($s && $s['mime'])){
            return false;
        }
        header ('Content-Type: ' . $s['mime']);
        header ('Content-Length: ' . filesize($file) );
        header ('Cache-Control: no-store, no-cache, must-revalidate, max-age=0');
        header ("Pragma: no-cache");
        $bytes = @readfile($file);
        if($bytes > 0){
            return true;
        }
        $content = @file_get_contents ($file);
        if ($content != FALSE){
            echo $content;
            return true;
        }
        return false;

    }
    protected function set404(){
        $this->is404 = true;
    }
    protected function is404(){
        return $this->is404;
    }
}